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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1741708840; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=CDc7/ZAT5C8YLyxi7akQ15Oo1z5OtAKquDiEGruG1tY=; b=LA+1dwO6iJMprk3XuCwJ1WKYE9g0dWsLBmqj5AJoJd74IpXWphJJgJwSWHAmU2iA1gY3LW NYjileGBz/wj5C9VKRUgXoUDSPP8omhLjL0iKNp29zxLHlnu+mX+fuB5LUbgZNhHZ+7uRs K3MYLsJgkqX77HMILOqZujy5S4BKXjA= X-MC-Unique: gR-2nzPMMbi1r7GCSJqDSg-1 X-Mimecast-MFC-AGG-ID: gR-2nzPMMbi1r7GCSJqDSg_1741708838 From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, stefanha@redhat.com, qemu-devel@nongnu.org Subject: [PULL 06/22] aio-posix: Factor out adjust_polling_time() Date: Tue, 11 Mar 2025 17:00:05 +0100 Message-ID: <20250311160021.349761-7-kwolf@redhat.com> In-Reply-To: <20250311160021.349761-1-kwolf@redhat.com> References: <20250311160021.349761-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" Signed-off-by: Kevin Wolf Message-ID: <20250307221634.71951-5-kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi Signed-off-by: Kevin Wolf --- util/aio-posix.c | 77 ++++++++++++++++++++++++++---------------------- 1 file changed, 41 insertions(+), 36 deletions(-) diff --git a/util/aio-posix.c b/util/aio-posix.c index 95bddb9e4b..259827c7ad 100644 --- a/util/aio-posix.c +++ b/util/aio-posix.c @@ -600,6 +600,46 @@ static bool try_poll_mode(AioContext *ctx, AioHandlerL= ist *ready_list, return false; } =20 +static void adjust_polling_time(AioContext *ctx, AioPolledEvent *poll, + int64_t block_ns) +{ + if (block_ns <=3D poll->ns) { + /* This is the sweet spot, no adjustment needed */ + } else if (block_ns > ctx->poll_max_ns) { + /* We'd have to poll for too long, poll less */ + int64_t old =3D poll->ns; + + if (ctx->poll_shrink) { + poll->ns /=3D ctx->poll_shrink; + } else { + poll->ns =3D 0; + } + + trace_poll_shrink(ctx, old, poll->ns); + } else if (poll->ns < ctx->poll_max_ns && + block_ns < ctx->poll_max_ns) { + /* There is room to grow, poll longer */ + int64_t old =3D poll->ns; + int64_t grow =3D ctx->poll_grow; + + if (grow =3D=3D 0) { + grow =3D 2; + } + + if (poll->ns) { + poll->ns *=3D grow; + } else { + poll->ns =3D 4000; /* start polling at 4 microseconds */ + } + + if (poll->ns > ctx->poll_max_ns) { + poll->ns =3D ctx->poll_max_ns; + } + + trace_poll_grow(ctx, old, poll->ns); + } +} + bool aio_poll(AioContext *ctx, bool blocking) { AioHandlerList ready_list =3D QLIST_HEAD_INITIALIZER(ready_list); @@ -682,42 +722,7 @@ bool aio_poll(AioContext *ctx, bool blocking) /* Adjust polling time */ if (ctx->poll_max_ns) { int64_t block_ns =3D qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - star= t; - - if (block_ns <=3D ctx->poll.ns) { - /* This is the sweet spot, no adjustment needed */ - } else if (block_ns > ctx->poll_max_ns) { - /* We'd have to poll for too long, poll less */ - int64_t old =3D ctx->poll.ns; - - if (ctx->poll_shrink) { - ctx->poll.ns /=3D ctx->poll_shrink; - } else { - ctx->poll.ns =3D 0; - } - - trace_poll_shrink(ctx, old, ctx->poll.ns); - } else if (ctx->poll.ns < ctx->poll_max_ns && - block_ns < ctx->poll_max_ns) { - /* There is room to grow, poll longer */ - int64_t old =3D ctx->poll.ns; - int64_t grow =3D ctx->poll_grow; - - if (grow =3D=3D 0) { - grow =3D 2; - } - - if (ctx->poll.ns) { - ctx->poll.ns *=3D grow; - } else { - ctx->poll.ns =3D 4000; /* start polling at 4 microseconds = */ - } - - if (ctx->poll.ns > ctx->poll_max_ns) { - ctx->poll.ns =3D ctx->poll_max_ns; - } - - trace_poll_grow(ctx, old, ctx->poll.ns); - } + adjust_polling_time(ctx, &ctx->poll, block_ns); } =20 progress |=3D aio_bh_poll(ctx); --=20 2.48.1